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Note 12 - Commitments and Contingencies (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Self Insurance Excess Reinsurance |  | $ 95,000 |  |
Self Insurance Excess Reinsurance Medical and Prescription Drug |  | 1,000,000 |  |
Self Insurance Excess Reinsurance Aggregate Deductible |  | 2,500,000 |  |
Self Insurance Plan Expenses |  | 2,000,000 | 1,200,000 | 1,100,000
Self Insurance Workers' Compensation Claims Amount Per Occurrence |  |  |  | 250,000
Self Insurance Workers' Compensation Claims Maximum Liability |  |  |  | 2,900,000
Liability for Unpaid Claims and Claims Adjustment Expense, Reported and Incurred but Not Reported (IBNR) Claims |  | 1,400,000 | 1,300,000 |
Litigation Settlement Bond | 156,000 |  |  |
RHB [Member] |  |  |  |
Litigation Settlement, Gross | $ 1,000,000 |  |  |

X
- Definition Element represents the expense of bond to cover court judgement. + References No definition available. + Details
Name: | strl_LitigationSettlementBond
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Self Insurance Excess Reinsurance + References No definition available. + Details
Name: | strl_SelfInsuranceExcessReinsurance
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Self Insurance Excess Reinsurance Aggregate Deductible + References No definition available. + Details
Name: | strl_SelfInsuranceExcessReinsuranceAggregateDeductible
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Self Insurance Excess Reinsurance Medical and Prescription Drug + References No definition available. + Details
Name: | strl_SelfInsuranceExcessReinsuranceMedicalAndPrescriptionDrug
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Self Insurance Plan Expenses + References No definition available. + Details
Name: | strl_SelfInsurancePlanExpenses
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Self Insurance Workers' Compensation Claims Amount Per Occurrence + References No definition available. + Details
Name: | strl_SelfInsuranceWorkersCompensationClaimsAmountPerOccurrence
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Self Insurance Workers' Compensation Claims Maximum Liability + References No definition available. + Details
Name: | strl_SelfInsuranceWorkersCompensationClaimsMaximumLiability
Namespace Prefix: | strl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedIBNRClaims
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration